[その他セミナー/研究会]
理論インフォーマルセミナー：On the number of Nambu-Goldstone bosons and its relation to charge densities
理論インフォーマルセミナー：On the number of Nambu-Goldstone bosons and its relation to charge densities
| 標題： | 理論インフォーマルセミナー：On the number of Nambu-Goldstone bosons and its relation to charge densities |
| 日時： | 2012年1月10日(火) 午前11:00～午後0:00 |
| 場所： | 物性研究所本館6階 第2セミナー室（A612) |
| 講師： | 渡辺 悠樹 氏 |
| 所属： | University of Tokyo and UC Berkeley |
| 要旨： | The importance of Spontaneous Symmetry Breaking (SSB) and the associated Nambu-Goldstone (NG) bosons is widely understood not only in particle physics but also in other fields, including condensed matter physics. Although the physics of NG bosons is well-understood in relativistic systems, once we discard the Lorentz symmetry the precise characterization of the number and dispersion relations is still an open problem. I will give an overview of our recently proposed conjecture which relates the number of NG bosons with the generalized charge density of the ground state [1]. In addition, I will briefly explain a framework to handle SSB of transnational invariance itself. As an example, (ferromagnetic) supersolid will be discussed [2]. [1] H. Watanabe, T. Brauner, Phys. Rev. D 84, 125013 (2011), arXiv:1109.6327 [2] H. Watanabe, T. Brauner, to be submitted to PRA, arXiv: 1112.3890 |
| 世話人： | 押川 正毅 (内線：63275) e-mail: oshikawa :at: issp.u-tokyo.ac.jp |